Thanks for your comments Freefly & Nirvanray.... I planed to post some more SlowMo videos in the future. :-)
To answer Freefly's question, I used a helmet camera Drift HD (Drift Innovation) with a wide angle (170°) , able to film in Full HD, HD or SD, and from 25 to 60 frames/sec. Such cams are normaly used for extreme sports (ski , snow, bike DH, etc...) but I decided to try it also for standard holidays films.
I used Magix VDL MX Plus to edit the film and soundtrack but to increase the number of frames, in order to obtain a super slow motion, I used Virtualbub and Avisynth. You also can export/import several times the sequence in Magix reducing to speed at each step... It also works fine (I tested this also).